Computer Science
Scientific paper
Jul 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973e%26psl..19..321t&link_type=abstract
Earth and Planetary Science Letters, Volume 19, Issue 3, p. 321-329.
Computer Science
31
Scientific paper
The isotopic composition of lead was determined for two carbonaceous, two H, and two L chondrites. All are falls. The 206Pb/204Pb ratios cover a range from 9.45 to 37.33; the 207Pb/204Pb ratios range from 10.39 to 26.10. The isotopic data define a 207Pb/206Pb age of 4.635 AE. Uranium and lead concentration data indicate that the isotopic lead ages for the Bruderheim chondrite are concordant within approximately 20%. This contrasts with lead data in the literature for chondrites, which consistently indicate discordant isotopic lead ages due to large excesses of radiogenic lead by factors of two or more. The isotopic lead ages for Pultusk may be concordant; those for a sample of Richardton are not. The lack of concordance for Richardton is not due to the analytical procedures, rather it is likely a result of the handling history of the chondrite prior to analysis. The L-3 chondrite, Mezo-Madaras contains such a high concentration of lead - 5.27 PPM - that accurate ratios for primordial lead can be obtained. These are 206Pb/204Pb = 9.310; 207Pb/204Pb = 10.296, values which are in close agreement with a recently reported measurement on lead in troilite from the Canyon Diablo iron meteorite.
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